gilkerson



(No Model.) C

J. VANDENBURGH 8v J. A. GILKERSON'.

`SCREW CUTTING MACHINE. v

Patented Deo. 20,1881.-

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N, PUERS. Fumo-Li hagmpher. wnxhingmn. u4 C.

UNITED STATES PATENT OFFICE.

JESSE VANDENBURGH AND JAMES A. GILKERSON, F COR'ILAND, N. Y.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,322, dated December20, 1881.

Application filed June 30, 1881. (No model.)

To all whom it may concern Be it known that we, JEssE VANDENBURGH and JAMES A. GILKERsoN, citizens ot' the United States, residing at Cortland,in the county of Cortland and State ot' New York, have invented certainnew and usefulImprovementsin Screw-Cutting Machines; and we do herebydeclare the following to be a full, clear, and exact description ot" theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters or tgures of reference markedthereon, which form a part of this specitica tion.

In said drawings, Figure 1 represents a central longitudinal section ofthe die-carriers, supports, and actuating mechanism, showing the detailsof construction, combination, and adjustnient which are .peculiaritiesof our invention. Fig. 2 represents an end view of the chuck orsectional die holders or carriers. Fig. 3 represents a plan view of someof the iinportant parts, and Fig. 4 represents in detail theconstruction of the actuating clutch-lever.

In the several figures the same letters of ret'- erence indicate likeparts.

Our invention relates more particularly to cutting threads upon boltsand rods, and its object and purpose is to do the same easily andreadily and allow the bolt or rod to have its thread cut and the dies tobe disengaged therefrom without running them back off the thread so cut;and our invention consists in the arrangement and combination of theherein described and shown mechanism, whereby the foregoing objects andpurposes are accomplished.

We now proceed to describe in detail our invention with reference to thesaid drawings.

A represents the hollow mandrel, to which power is applied through themedium of the pulleyr B, which runs loose upon the mandrel when the diesare not doing labor. The front side of the hub of the pulley hasclutch-teeth, which engage in the cam and clutch-sleeve C, which slideson the mandrel A, and is guided by the feather-key or spline D. Thissleeve C and the hub of pulley B are both inclosed, and run inthe frontor main bearing, E, thereby preventing the noise which would be producedif the clutches were not covered, and also excluding all particles ot'dirt and chips, which would get in and hinder the free working ot' themachine. Upon the end of the mandrel A is the tlange or face-plate F,either forged solid or fixed thereto, to which fiange the die carriers Gare pivoted by means of' a screw stud or rivet, H, each carrier havingin the opposite end a pin, I, which, engaging in the cam or angularslotJ inthe cam-plate K, fastened to theclutchsleeve C, form themechanism'by which the adjustments are made. rlhe dies L are fastenedsubstantially to the carriers G in any suitable manner; or they may bemade a part of and solid with the carriers G, it being immaterial howthey are made, as long as they form a part'ot and move only in directconnection with the sectional carriers G.

The operation of the machine is substantially as follows: The drawingsrepresent the machine in readiness to work the clutch-sleeve C, beingengaged in the clutch upon the hub ot' the pulley, and the pin Ibeing inthe straight .partofthecam-slotJ. The blank being brought up to andpushed into the threading-dies L, it is drawn into them andthreaded'until the required length ofthread is obtained, when, either byan attendant or by automatic mechanism, the sleeve() is moved toward thehead or ange F, causing the 'cam-slots to move the pins I, therebycausing the carriers G to open, relieving the screw, when it is drawnout of the dies. The next operation isto throw the clutch which closesthe dies into gear and repeat the operation.

It will be noticed that when the dies are in position for operation thestrain all comes upon the side of the straight part of the slot J, andto compensate for the wear upon this part, it being the only point withwhich wear will cause any variation in the size of the screw whenthreaded, the dovetailed piece M, made ot' hard steel, is fastened intothe plate K, and may be replaced by another at a tritling cost. Therebeing no motion between the pin I and the dovetailed piece M when thedies are working, there will be very little wear on either ot' them.

Now, for operating the clutch and cams the lever and ring shown in Fig.4 are used. W

IOO

represents the lever, and P and Q the ring,

VWheel may be substituted for the pulley B,

Which latter is made substantially as follows: The pieces for the ring Qand P are made in separate sections, which unite through the bosses orhubs R, and are fitted together and riveted. It is then bored out to fitthe groove S, turned into the clutch-sleeve C, and an oilhole, T, isdrilled longitudinally through one of the bosses It, for the purpose ofsupplying oil to the groove S in the clutch-sleeve G, said bosses beingturned to fit holes which are drilled into the ends of the lever-arms Nand O, which, when put together, form the bifurcated lever XV, whichnieves the clutch-sleeve C, and at the same time operates the adjustmentofthe dies and die-carriers Gr.

It is obvious that aeluteh-lever and ring` made in this manner will savea great deal in cost and Wear, as it reduces the parts to the leastpossible number and saves much time and labor in construction. U is abearing, which supports the back end of the mandrel A, and VV arethrust-collars, which hold the mandrel and keep it from moving endwisethrough the pulley-huh B and bearing U.

For obtaining variations of speed a gearhaving a hub made similar to thepulley-hub and driven loy a counter-shaft having a conepnlley upon it.

Having described our invention, what We claim as new, and desire tosecure by Letters Patent, is

l. The cutting-dies and carriers and the carrier-shifting cams, combinedwith mechanism G I, 85e., for moving said cams and throwing thecutting-dies in or out of operation as the carriers are thrown in or outof connection with the power, as specied,

2. The plate K, having the dovetailed hardened Wearing piece M, combinedwith the clutch-shifter and the die-carriers, as and for the purposesset forth. e

3. The plates K, having inclined slots J, the Wearing-pieces M, and pinsI, combined with the clutch, clutch-shifter, the diecarriers, the dies,and the power-shaft, as and for the purposes set forth.

In testimony whereof we aflix our signatures in presence ot' twoWitnesses.

JESSE VANDENBURGH. JAMES A. GILKERSON. Vitnesses JOHN W. SUGGETT, EMrLUsGURLEY.

